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Re: [Xen-devel] [PATCH 01/44] kernel: Add support for poweroff handler call chain


This seems exactly what I would need on the mc13783 to handle cleanly the poweroff,
but after reading this patchset I have the following question:


+ *     Notifier list for kernel code which wants to be called
+ *     to power off the system.
+ */
+static ATOMIC_NOTIFIER_HEAD(poweroff_handler_list);


+void do_kernel_poweroff(void)
+       atomic_notifier_call_chain(&poweroff_handler_list, 0, NULL);

It seems that the poweroff callback needs to be atomic as per
_atomic_notifier_call_chain documentation:

        "Calls each function in a notifier chain in turn.  The functions
         run in an atomic context"

But this is a problem for many MFD (mc13783, twl4030 etc ...) which are
accessible on only a blocking bus (SPI, I2C).

What I am missing here ?



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